You can find it on the Poppy Playtime Steam Page . Chapter 1 is free, but Chapter 2 is listed as a paid DLC.
You may see "Free" listings on third-party sites, but these come with significant risks: Poppy Playtime Chapter 2 Download Free
Searching for " Poppy Playtime Chapter 2 Download Free" can be tricky because while Chapter 1 is often free-to-play, is typically a paid expansion or DLC (Downloadable Content). You can find it on the Poppy Playtime Steam Page